Fix admin Create $20 checkout button to call checkout session API and show UX feedback

[GsCommand]

Motivation

• The admin "Create $20 checkout" action in the claim detail UI for cards_published claims was not wired to a proper frontend function and did not create Stripe checkout sessions or surface errors to the operator.
• The change is intended to ensure the admin UI posts { claimId } to the backend POST /api/admin/create-checkout-session, shows loading state, and renders success and error information inline.

Description

• Replaced the previous no-op checkout call with a new createCheckoutSession(claimId) function that posts { claimId } to POST /api/admin/create-checkout-session, guards for missing claimId, and sets s.checkoutLoading/s.checkoutUrl state for UI feedback.
• Render logic updated so the checkout button shows Creating checkout... and is disabled while the request is in flight, and a success panel appears with Open checkout and Copy checkout URL when a URL is returned.
• Error rendering added to surface API and runtime failures inline in <status> — <error> format (no alert()), and the frontend accepts checkoutUrl or url from the API (prefers checkoutUrl).
• Ensured buttons created by JS are type="button" to avoid unintended form submissions and fixed copy button wiring for the returned checkout URL.
• File changed: public/admin/claims.html (frontend only).

Testing

• Ran npm test in the repo and the full suite passed (103 tests, all passing), including coverage for admin checkout-related behaviors such as unauthorized/unauthenticated checks and cards_published checkout creation.
• Ran cd examples/webhook-auto-verify && npm run check and the example checks passed successfully.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
commandlayer-commandlayer-org	Ready	Preview, Comment	May 24, 2026 12:32am
commandlayer-org	Ready	Preview, Comment	May 24, 2026 12:32am
commandlayer-org111	Ready	Preview, Comment	May 24, 2026 12:32am